“Skydome creates a 3D environment for your After Effects compositions at the touch of a button. The environment then responds to your camera's position, orientation, rotation and lens properties.”

With your composition selected, simply run the script. A background composition is created with a default pattern inside. Simply drop an HDRI image or any other material into this composition and it will become the environment for your After Effects comp.

Install this script in the Scripts folder. It does not have a dockable UI.